This week we bring you a special edition podcast about sleep — but we promise it’s a wide-awake listen! TIME senior editor Jeffrey Kluger explains why your brain may be at its most creative while you sleep, and TIME senior …

War veterans with severe pain may need drugs like morphine and hydrocodone to manage it, but the medications are associated with higher rates of overdose and self-harm in those with post-traumatic stress.

Why are some people able to recover from the trauma of a violent attack or combat zone, while others suffer from recurrent flashbacks, episodes of depression and other debilitating symptoms of post-traumatic stress disorder (PTSD)?